PI: 
	"How I need a drink, alcoholic, of course".
(3.1415926)
	

The planets in our solar system (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto):
	"My very elegant mother just served us nine pizzas"
	or "My very easy method just speeds up naming planets" (thanks, Cheryl)
You killed Pluto, you bastards! (August 2006) 
I suppose we'll have to use:
	"My very elegant mother just served us nothing"
	or "My very easy method just speeds up nomenclature"

The twelve Cranial nerves: 
      Olfactory, Optic, Oculormotor,
      Trochlear, Trigeminal, Abduceans, Facial, Auditory,
      Glosspharyngeal, Vagus, Accessory, Hypoglossal 
make 
      "On Old Olympus' Towering Tops A Foolish Austrian 
      Grew Vines and Hops."

http://www.demon.co.uk/mindtool/memory.html

My English teacher's list of the exceptions to the "i-e" 
rule ("I before E except after C, or when sounded as 
A, as in neighbor and weigh"), slightly improved:
      The ancient society of weird foreign scientists
      seized neither leisure nor the sheik's heifers
      at these heights.

The spectrum of colors in sunlight:
	Roy G. Biv
(red, orange, yellow, green, blue, indigo, violet)
Or: 
Richard Of York gave battle in vain (thanks, Thomas David Baker)

The great lakes, 
      Huron, Ontario, Michigan, Erie and  Superior
become
      HOMES
or: 
      Super Man Helps Every One

Four American states border Mexico - try
	CAN'T 
for California, Arizona, New Mexico, and Texas.

Geologic periods:
      Cambrian Ordovician Silurian Devonian Carboniferous 
      Permian Triassic Jurassic Cretaceous Eocene 
      Oligocene Miocene Pliocene Pleistocene Holocene 
from:
      CAMels Often Sit Down CARefully, PERhaps Their Joints
      CREak: Early Oiling May Prove Positively Helpful

The Iriquois tribes:
      Mohawk, Seneca, Oneida, Onondaga, Cayuga
become 
      [does someone have the answer to this one?]

The zoological groupings:
      Kindom Phylum Class Order Family Genus Species
becomes
      King Philip Came Over For Golf Shoes.
(Sadie Van Buren, Waltham, MA)